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Contrast ratio improving method for liquid crystal projector

  • US 20030112414A1
  • Filed: 11/12/2002
  • Published: 06/19/2003
  • Est. Priority Date: 05/22/2000
  • Status: Abandoned Application
First Claim
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1. A method for improving the contrast ratio of the display image projected on a screen from a liquid crystal projector that comprises at least a light source, an electrode-having, twisted nematic liquid crystal cell (hereinafter referred to as a TN liquid crystal cell), and two polarizers disposed so that the liquid crystal cell is sandwiched between them, which is characterized in that at least two, hybrid-oriented liquid crystal layer-having optical films (hereinafter referred to as HBLC optical films) are so arrayed between the polarizers that the slow axes of the films are approximately perpendicular to each other so as not to cause a retardation in the direction normal to the film surfaces.

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